Zain Iraq APN Settings for Nokia Lumia 2520

ZAIN-GPRS

If your phone supports more than 1 SIM card, choose SIM 1 settings or SIM 2 settings depending on the SIM that you want to use for ZAIN-GPRS.
Turn on Data Connection.

Enable Use cellular data in For limited Wi-Fi connectivity
If you have more than 1 SIM card choose the SIM card for data connection in SIM for data connection
Enable 3G connection for faster data transfer speeds. Also enable Highest connection speed

Zain-MMS (MMS) APN

If your phone supports more than 1 SIM card, choose SIM 1 settings or SIM 2 settings depending on the SIM that you want to use for Zain 2.
Turn on Data Connection.

Enable Use cellular data in For limited Wi-Fi connectivity
If you have more than 1 SIM card choose the SIM card for data connection in SIM for data connection
Enable 3G connection for faster data transfer speeds. Also enable Highest connection speed

We have 2 manual configuration APN settings for Zain above. Try one by one until you get your internet working in your Nokia Lumia 2520.
This includes 1 picture messaging APN configuration for Zain as well.